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  <title>Get an Apache subprocess_env variable</title>

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</div><hr /><div id="function.apache-getenv" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">apache_getenv</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">apache_getenv</span> &mdash; <span class="dc-title">Get an Apache subprocess_env variable</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.apache-getenv-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">string</span> <span class="methodname"><strong>apache_getenv</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$variable</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$walk_to_top</code><span class="initializer"> = false</span></span>
  ] )</div>

  <p class="para rdfs-comment">
   Retrieve an Apache environment variable specified by 
   <em><code class="parameter">variable</code></em>.
  </p>
  <p class="para">
   This function requires Apache 2 otherwise it&#039;s undefined.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.apache-getenv-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">variable</code></em></dt>

     <dd>

      <p class="para">
       The Apache environment variable
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">walk_to_top</code></em></dt>

     <dd>

      <p class="para">
       Whether to get the top-level variable available to all Apache layers.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.apache-getenv-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   The value of the Apache environment variable on success, or <strong><code>FALSE</code></strong> on
   failure
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.apache-getenv-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4654">
    <p><strong>Example #1 <span class="function"><strong>apache_getenv()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     The example above shows how to retrieve the value of the Apache
     environment variable <var class="varname"><var class="varname">SERVER_ADDR</var></var>.
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$ret&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">apache_getenv</span><span style="color: #007700">(</span><span style="color: #DD0000">"SERVER_ADDR"</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">$ret</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
42.24.42.240
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.apache-getenv-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.apache-setenv.html" class="function" rel="rdfs-seeAlso">apache_setenv()</a> - Set an Apache subprocess_env variable</span></li>
    <li class="member"><span class="function"><a href="function.getenv.html" class="function" rel="rdfs-seeAlso">getenv()</a> - 获取一个环境变量的值</span></li>
    <li class="member"><a href="language.variables.superglobals.html" class="link">Superglobals</a></li>
   </ul>
  </p>
 </div>

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